A religious monument is not usually a product of its own local epoch, but the epoch was technically and artistically capable of expressing the origins of a past golden age. Stone monuments tend to express an age that preceded the time of it's construction. Hence, the Great Pyramid was determined to be a time capsule.

When Sir Christopher Wren built St. Paul's Cathedral in London in the late seventeenth century, he used modern technology and art in architectural countenance and symbolism which had Christianity as its source.

It would be preposterous to suggest that the religion was created by the epoch when the cathedral was built. The same applies to the Vatican Basilica of St. Peter's and other monuments. Christianity had its epoch when Jesus roamed the land, and the cathedral is a later epoch's expression of it in a new-found ability to materially express it.

Since artists such as Michelangelo, and Architects such as Wren were able to draw upon ideas from the 1st to the 5th century A.D. , how old could have been the religious ideas that were incorporated into the building of the Great Pyramid. Perhaps hundreds of years, and maybe even longer.